我想把图片转换成webp格式。
这是我的php代码：

$im = new Imagick();
$image = file_get_contents($url);
try {
        $im->readImageBlob($image);
        $im->setImageFormat( "webp" );
        $im->setOption('webp:method', '6');
} catch (ImagickException $e) {
        echo $e->getMessage();
}
$im->destroy();

但此代码会产生以下错误：
无法设置图像格式
当以下代码在终端中正常工作时，会发生这种情况：

magick convert 1.jpg 2.webp

和

convert 1.jpg 2.webp

操作系统版本：

CentOS Linux release 7.9.2009 (Core)

PHP版本：

PHP 7.4.29 (cli) (built: Apr 18 2022 22:43:47) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
    with the ionCube PHP Loader + ionCube24 v11.0.0, Copyright (c) 2002-2021, by ionCube Ltd.
    with Zend OPcache v7.4.29, Copyright (c), by Zend Technologies

魔术版本：

Version: ImageMagick 7.1.0-30 Q16-HDRI x86_64 19924 https://imagemagick.org
Copyright: (C) 1999 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC HDRI OpenMP(3.1) 
Delegates (built-in): bzlib djvu fontconfig freetype jng jpeg lzma openexr pangocairo png tiff x xml zlib
Compiler: gcc (4.8)

转换版本：

Version: ImageMagick 7.1.0-30 Q16-HDRI x86_64 19924 https://imagemagick.org
Copyright: (C) 1999 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC HDRI OpenMP(3.1) 
Delegates (built-in): bzlib djvu fontconfig freetype jng jpeg lzma openexr pangocairo png tiff x xml zlib
Compiler: gcc (4.8)

CWEBP版本：

0.3.0

Imagick PHP扩展信息：

imagick
imagick module => enabled
imagick module version => 3.7.0
imagick classes => Imagick, ImagickDraw, ImagickPixel, ImagickPixelIterator, ImagickKernel
imagick.allow_zero_dimension_images => 0 => 0
imagick.locale_fix => 0 => 0
imagick.progress_monitor => 0 => 0
imagick.set_single_thread => 1 => 1
imagick.shutdown_sleep_count => 10 => 10
imagick.skip_version_check => 0 => 0